ABB Relion 670 Series Commissioning Manual page 137

1MRK 511 403-UEN Rev. K
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3. Activate the RESETCOMP input to ensure that the stored values are reset to zero.
4. The logical signals and service values for SCUCPTOC function are available on the local HMI
under: Main menu/Tests/Function status/Unbalance protection /
CapBankCurrentUnbalance(60N, Iub>)/SCUCPTOC(60N, Iub>):x/outputs , where x =
instance number.
5. To store the unbalance current values, perform these steps:
Step No.
5-a
5-b
5-c**
* - CT ratios of the phase currents (1000/1 A) and unbalance currents (10/1 A). The values of IB1 and IB2 are
considered as 1000 A and 10 A, respectively. The current inputs I
inputs and I
** - This step should be done only during Factory Acceptance Test (FAT). At field, the testing should be done
with the stored field values.
6. Check the respective operation of warning, alarm, and trip.
Step No.
6-a
6-b
Table continues on next page
Bay control REC670
Commissioning manual
IUnbalAlm> = 20% IB2
IUnbalWrn> = 10% IB2
IMin = 10% IB1
Changes after step 3
Inject constant currents* of I
1∠240° A, and I = 1∠120° A in secondary
L3
at rated frequency.
Inject I = 0.2∠0° A in secondary at rated
UNBL1
frequency
Activate binary input TRIGCOMP for 1 s
refer to the unbalance current inputs.
UNBL1
Changes after step 5
Retain constant currents* of I
A, I = 1∠240° A, and I
L2
secondary at rated frequency.
Change I = 0.35∠0° A
UNBL1UNBˍA
Change I = 0.45∠0° A
UNBL1
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Expected output
= 1∠0° A, I = IL1 should show 1000 A
L1 L2
IL2 and IL3 should show 0 A
since SCBConf = 1 unbalance curr
IUNBL1 and IUNBCLCL1 should show 2 A
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The following outputs should show the mentioned
values:
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L1
Expected output
WARNING TEST
= 1∠0° WARNING and WRNL1 signals should become HIGH
L1
after the set time delay
= 1∠120° A in
L3
IUNBL1 = 3.5 A
IUNBCLCL1 = 1.5 A which is equivalent to 15% of
IBase2
ALARM TEST
ALARM and ALML1 signals should become HIGH after
the set time delay
IUNBL1 = 4.5 A
IUNBCLCL1 = 2.5 A which is equivalent to 25% of
IBase2
Testing functionality by secondary injection
The output COMPEXED should become
HIGH for 100 ms
The output LASTCOMP should display the
date and time of compensation
IMEML1 = 1000 A
IMEMUNBL1 = 2 A
IREFUNBL1 = 2 A
IUNBCLCL1 = 0 A
, I , and I refer to the phase current
L2 L3
Section 11
131